The Ludlow, Mass. man was walking “northbound along the tracks” about 9 a.m. Monday when he was hit by the Boston-bound train and thrown into the Mystic River, Groton police Lt. John Varone said in a statement.

“The male was rescued from the water and transported to Lawrence and Memorial Hospital, where he was pronounced dead,” Varone said.

The fatal incident occurred near a bridge close to the School Street crossing, the lieutenant said. About 210 passengers were on the Acela Express train.